Eighty-one male subjects performed four information processing tasks and six dual task combinations, and completed a battery of psychometric ability tests selected to define three first-order factors and a second-order general ability factor. Confirmatory maximum likelihood factor analyses of the performance data provided no support for a general time-sharing factor, but a model with factors corresponding to the four single tasks provided a good fit to the data. The Grammatical Reasoning factor was highly correlated with the Verbal and second-order General Ability factors, suggesting that this task may be a good single index of total attentional resources.
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